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Distributed denial of service (DDoS) attacks in the Internet pose huge problems on nowadays communication infrastructure. Attacks either destroy information or impede access to a service. Since the significance of the Internet to business and economy is growing rapidly, efficient protection mechanisms are urgently required to protect hosts from being infected and, more important, sites from being attacked. Detection of DDoS attacks requires deep packet inspection at link speed, and context-dependent packet handling for countermeasures. This functionality is not achievable with nowadays commercial high-performance routers. In this paper, we therefore present our problem space exploration of DDoS attacks and propose a flexible service architecture for detection and filter mechanisms to counteract DDoS attacks. To achieve the performance required for backbone routers together with the flexibility needed for services counteracting DDoS attacks, we base the proposal on our PromethOS NP router platform that manages and controls hierarchical network nodes built of network and host processors.

A Detection and Filter System for Use Against Large-Scale DDoS Attacks in the Internet Backbone